AR150 hissing sound

I can hear hissing sound from my router. The heavier the router load, the louder the sound. I think the noise is from the coil in 5V to 3.3V DCDC converter. Can someone tell me the capacity of the inductor and which one is it? I have tools and can replace it myself.

This is the first time we have received such feedback. Could you please return the device to us for analysis?

Check the wall-plug adapter - some USB PSU’s might be less than optimal, and introduce noise on to the DC bus into the AR150. The “hissing” you hear is coil-whine

It’s harmless enough - but with more than 40 ar150’s fielded, I honestly have not seen anything resembling noises like you’ve mentioned.